Stay feeding device for boxmaking machines



Feb. 4, 1958 C, SCHWARZ 2,821,889

STAY FEEDING DEVICE FOR BoxMAxING MACHINES Filed April 5, 195e 2 Sheets-Shelet 1 UIL INVEN TOR CARL 4'SCHWARZ' Y y l A JFm/VEY STAY FEEDING DEVICE FOR BOXMAKING MACHINES Filed April 5, 1956 2 Sheets-Sheet 2 IN VEN TOR 4 CARL. SCHWARZ BY UnitedStates Patent O STAY FEEDING DEVICE FOR BOXMAKING MACHINES Carl Schwarz, Philadelphia, Pa.

Application April 5, 1956, Serial No. 576,303

1 Claim. (Cl. 93-84) This invention relates generally to new and useful improvements in paper box making machines.

More particularly, the present invention proposes the construction of an improved apparatus for feeding and shaping flexible strip material for making stays for reinforcing corners of paper boxes and the like to be attached to a paper box making machine.

t Another object of the invention is to provide apparatus of this kind which will positively and automatically feed flexible strip material for making stays and will shape and support the material for the cutting operations, and for application to the corners of boxes and the like.

A specific object of the invention is to provide apparatus of this kind with a base adapted to be secured to a box making machine and with a slide plate on the base provided with a pivoted strip clamping lever for clamping the strip material and advancing the same through y the apparatus.

Another specific object of the invention is to provide apparatus of this kind with novel mechanism for shaping the fed strip material and for holding same in condition for cutting and for application to the corners of a box or the like.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawings, and to the appended claim in which the various novel features of the invention are more particularly set forth.

In the accompanying drawings forming a material part of this disclosure:

Fig. l is a top plan View of apparatus for feeding, shaping and supporting strip material for stays made in accordance with the present invention, with the material clamping lever in inoperative position.

Fig. 2 is a side view of the structure Shown in Fig. l.

Fig. 3 is a sectional view taken on the line 3-3 of Fig. 1.

Fig. 4 is an end view of the apparatus.

Fig. 5 is a sectional view taken on line 5-5 of Fig. l.

Fig. 6 is a sectional view taken on line 6-6 of Fig. 1.

Fig. 7 is a sectional view taken on line 7 7 of Fig. l.

Fig. 8 is a fragmentary side elevational view similar to Fig. 2 but showing the slide plate moved inwardly and the clamping lever in operative position.

Fig. 9 is a horizontal sectional view taken on line 9-9 of Fig. 3.

Referring more particularly to the drawings, the stay feeding apparatus of the present invention is designated generally by the reference numeral 15.

The stay feeding apparatus comprises a base 16 with a screw hole 17 to receive a fastening element for fastening to a paper box making machine (not shown). The base 16 is formed with a channel 18 defined by the sides of the base and by side plates 19 and 20 fastened to the upper surface of the sides of the base by screws 21, the plates 19 and 20 partly overhanging the channel 18.

2,821,889 Patented Feb. 4, 1958 A slide plate 22 for mounting the clamping and feeding mechanism for the stay forming material is slidably mounted in the channel 18 of base 16 beneath the side plates 19 and 20 for reciprocation along the channel 18. Means is provided for frictionally holding the slide plate 22 and its associated parts in moved adjusted position against accidental displacement. This means includes a separate narrow bar 22 of the same length as the plate attached to one side of the slide plate and yieldably movable laterally of said plate. This attachment includes pins 21 secured to the bar adjacent its ends and protruding laterally thereof. The pins extend loosely into spaced recesses 20' formed in the side of the slide plate 22. Spiral springs 19' seated in recesses 18 in said side of the plate 22 impinge against the bar for urging the bar away from the plate and into frictional engagement with the inner surfaces of the sides of the base 16 defining the channel 18.

Fixed on the inner end of the slide plate 22 and centrally thereof there is a gripper plate or bar 23 formed with triangular-shaped serrations 24. On the slide plate, on opposite sides of the bar 23 there are upright bearing members 25. A clamping lever 26 is pivotally mounted between the upright bearing members 25 on a pivot pin 27 extending between and journalled in the uprights and fastened thereto by a cotter pin 27. The clamping lever 26 is disposed directly over the bar V23 and is formed with a toe portion 28. The toe portion 28 is formed withI an inverted V-shaped notch 28 extending along its undersurface conformable to the shape of the serra- 1 tions.y 24 ofthe plate l23v so `that the toe portionisadapted to clamp a strip of material fed from a supply roll (not shown), such as gummed tape 29, shown in dot-dash lines in Fig. 3 to the slide plate 22. The strip of material is fed forwardly of the apparatus, shaped and cut into stays or strips for reinforcing the corners of boxes and the like.

A crank 30 is secured by a pin 31 to the upper end 32 of the clamping lever 26 and a reciprocating actuating lever 33 is pivotally secured to the crank 30. A pin 34 constituting a stop extends across the space between the uprights 25 for limiting movement of the clamping lever 26 to inoperative position.

At the front end 35 of the base, a device indicated generally at 36 for guiding, shaping and supporting the forward end of the strip of stay forming material 29 is mounted for up and down movements on an L-shaped bracket 37 xed to the base. The device 36 comprises an L-shaped bracket member 36 and a tubular member 38 formed integrally with the L-shaped bracket member 36. The latter bracket member is formed with an elongated vertically disposed central lug 37 disposed in a slot 39 formed in the L-shaped bracket 37, said slot opening upwardly through the bracket to permit removal and mounting of the device 36. A threaded bolt 41 is secured in an opening 40 extending through the L-shaped bracket 36 and the lug 37 and projects outwardly of the bracket 37. A nut 42 on the bolt fastens the device 36 to the bracket 37. The tubular member 38 is triangular in cross section providing a triangular-shaped opening 43 therethrough, the base of the tubular member being formed with a slightly inverted V-shaped indentation 38 therealong. The tubular member 38 is arranged so that its opening 43 is Substantially in line with the plate 23 on the slide plate 22 and with the toe portion 28 of the clamping lever 26.

In operation, the apparatus is mounted on its supporting surface with the extreme end of its forward end 35 positioned a predetermined distance from the cutting apparatus which includes an upper fixed block member 50 and a movable knife member 51 movable upwardly across the fixed member as shown by the arrow in Fig, 3.

The forward fend fof `the tape 29 is extended outwardly of vthe tubular member 38 and of the `cutting apparatus la distance equal to the length of the stay or strip desired to be cut from the tape. Upon movement of the crank 3'0 by the actuating l'e've'r 33, xthe fclarnping lever 326 is rocked on its `'pivot .27 :in :an "antiolockwise :direction as viewed iinlFig. :2, thereby imparting ito the Itoe portion '-28 of the lclamping lever -26 a downward movement and a forward thrust. The downward movement clamps 'the tape 129 between the'clamping -lever and plate 23 and the forward thrust-moves the fplate-22 with the clamped tape 29 lone hstep 4forward toward the guiding, shaping 'and supporting-device-36,fand-simultaneously moving the forward lk'end 'of the 'tape outwardly to 5a position -between the ixe'd block imember 50 fof Ethe #cutting apparatus and the movable lk'nife 551 vlin position to lb'e -cut oi -by lsaid knife, ft'o form a reinforcingstay Eto be fastened to fthe c'ornerof La box or the like as will be understood. lThe conforming '.s'hapes 'of the notch 328 and serrations y24 prevent Ydamage to --'the tape. The guiding, shaping and supporting device 36 is #movable -up and ldown along the bracket 37 in order to adjust the position of the tubular member 38 and thereby the protruding forward uncut 'end of the tape '29 so `that'the knife 51 will move 'clear of said -uncut end on itsd'ownward stroke. The backward lmovement of the actuating lever 33 lifts fthe toe portion 28 'of the clamping Vlever -26 oft' of the plate 23 and permitsthe shaping device "36 Vto'liftthe tape 29 off of fsaid plate 'thereby releasing the 'tape 29, permitting retraction'of the `slide plate 22 and its associated parts, without thetap'e.

While I have illustrated and described the preferred embodiment ofrny invention, itis to be-under'stoodthat vIdo fnot'limitmyself to the precise construction vherein dsc'losed'and that various changes and modificationsmay be made within the scope of the invention as defined in Athe rappende'drclaim.

Having thus described my invention, what I claim as new, and desire to secure by United States Letters Patent is:

Apparatus of the kind described comprising a base, having a channel on its upper surface, a plate slidably mounted in said channel, a serrated gripping plate secured to the upper :surface fof said slidable plate, a clamping lever pivotally mounted 'on 'said slidable plate over said gripping plate, said clamping lever having a grooved surface adapted "to coact with said Iserrated plate for gripping stay lformingmaterialtherebetween, :means for pivoting said clamping lever whereby said stay forming matelReferences Cited in the le of this patent UNITED .STATES PATENTS 442,792 Beach Dec. 16, 1890 1,198,564 McLaurin Sept. 19, 1916 1,286,873 De Smith Dec. 3, 1918 2,639,649 `Silby 'May 26, 1953 2,712,933 "Davidson July 12, 1955 

